Vacherin Constantin’s Tour de l’Ile – $1.5 million

Swiss watchmaker Vacheron Constantin marked its 250th anniversary in 2005 with the world’s most complicated wrist watch—the Tour de l’Ile. The watch is so complicated that it required over 10,000 hours of research to create. Its name refers to one of the historical sites of the venerable company, located next to the current Maison Vacheron Constantin on the Quai de l’Ile.

Only produced in a limited edition of seven pieces, this expensive watch is also the most complicated double-face watch. Tour de l’Ile is made with a totally original combination of horological complications (that is, features beyond the simple telling of the time of day) and astronomical indications composing a list of sixteen different points including a minute repeater, sunset time, perpetual calendar, second time zone, a tourbillion device, the equation of time and a representation of the night sky.

At $1.5 million, this is one of the world’s most expensive watch produced in recent years.